Check out the new USENIX Web site.
PapersUSENIX

A 3-tier RAID Storage System with RAID1, RAID5 and compressed RAID5 for Linux1 Check out the new USENIX Web site. next up previous
Next: Introduction

A 3-tier RAID Storage System with RAID1, RAID5 and compressed RAID5 for Linux1

K. Gopinath    Nitin Muppalaneni    N. Suresh Kumar    Pankaj Risbood


Computer Science and Automation Dept.
Indian Institute of Science, Bangalore
gopi@csa.iisc.ernet.in

Abstract:

This paper presents the design and implementation of a host-based driver (a ``volume manager'') for a 3-tier RAID storage system, currently with 3 tiers: a small RAID1 tier and larger RAID5 and compressed RAID5 (cRAID5) tiers. Based on access patterns (``temperature''), the driver automatically migrates frequently accessed data to RAID1 while demoting not so frequently accessed data to RAID5/cRAID5. The prototype system, called ``Temperature Sensitive Storage'' (TSS), provides reliable persistence semantics for data migration between the tiers using ordered updates or logging. Mechanisms are separated from policies through an API so that any desired policy can be implemented in trusted user processes. We also discuss the problems faced while moving from the original implementation on the Solaris platform to Linux. Finally, we present comparison of the performance of our design with comparable systems using striping or RAID5.



 
next up previous
Next: Introduction
Dr K Gopinath
2000-04-25




This paper was originally published in the Proceedings of the Freenix 2000 USENIX Annual Technical Conference, June 18-23, 2000, San Diego, California, USA

Last changed: 24 May 2000 mc

Technical Program
Conference index
USENIX home